Lester



LESTER & HJOSTBERG. ,Apparatus for Heating and Ventilating Building s.

Pate nted Jany B. 1860- ERQVNH m.

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UNITED 7 Moses w. LEs iR arPaRA'r s FOE finariivc AND vnlv'rrnarlivqSpecification, of Letters Pajea m. 26,686, dated January 1,3,1

To all whom it may concern: i

Be it knownfthat we, MosEsNV. LEsTER and MAX HJGRTSBERG, both of thecityuof Chicago, in the county of Cookand State of Illinois,haveinvented a new and useful Improvement in Air-Heating Devices forBuildings; and We do hereby declare the following to be a full, clear,and exact description thereof, reference being bad to the accompanyingdrawings, and to the letters of reference marked thereon, and making apartof this specification, inwhich- Figures 1, and, 2, are verticalsections right angles witheach other, and Figs. 3

and 4, are horizontal sections.

Similar letters of reference indicatecorresponding parts in the severalfigures. I

Our invention relates solely to anTimprovement in an air heating andventilating device (for which Chas. B. Sawyer obtained Letters-Patentfor an improvement on such device originally patented by John Sawyer)andin which a ventilating chamber, hotair chamber, hot air flue andventilating flue are arranged and combined in apeculiar manner foreffecting a desiredpurpose.

To enable others skilled in the art to construct and fully understandour invention we will proceed to describe our improvement, andsubstantially set forth the advantages gained thereby over that of Chas.B. Sawyer and John Sawyer.

(C) represents an air heating chamber extending the whole height of theapparatus Within which is placed the fire pot (K) with its dome (P). p i

(L) is the ash pit.

. (B) is the ventilating chamber described by Chas. B. Sawyer.

(A) is the smoke pipe and (D) the hot air pipes leading to the severalapartments to be heated.

Above the dome and below the ventilating chamber (B) are the radiatingdrums (H H) connected by the pipes (G G) through which, and through thepipe (0) the smoke and heat from combustion pass into the smoke flue (A)as indicated by the red archamber (C), their position:relative toraplaced immediately abovethejlhot aircham placed the pipes(I,aI)l;w1open atibothfends thus forming passageshthroughj which l thair immediately surrounding the dome and between the radiating pipes (1GG) may ,1 escape into the upper portion of the hot air y j I diatingpipes (GfG) shown in Fig.

Between the outside casings ar th spaces or openings Jthrdhghwhic thheat that i may radiatettthrough the ill'lll casing (Q) isconductedflintothe upper part of hot air chamber (G); blue arrowindicate direction ofcurrents of Lventilati the black arrows: show the irents of heated air. i i y (M) isthecold air bon eading out f doorsandthrough which offresh air is obtained.

By comparing the abovadelscribedflar rangement with thatfl ipatentedbyllJohnand Chas. BJSawyer its iadvantageswilh be s clearly perceivedfiB-efe 'ng toChasij B Sawyers patent it will be thattheven tilatingchamber (H); occu p es the whole} up per portion of the apparatuswhereby niuchl heat as well as room is lost,;thepartitionbe}; tween thehot airchainberjfl(F)f and the ven tilating chamber beingsingle muchheat radiates through the; sa1nej1in-chamber (G) and is lost by escapingthrough damper The chamber (H) being alsoithe receptacle; for smoke andheat} fronrcombustion. jand ber (F) becomes very hots and radiates fliheat freely in all directionsllfromitstop sides, which heat is thusjlostto the hot air flues (I, I) which are taken outbelow; H ventilatingflues(J)f being introduced kintofyg the cylindrical inclosureorventilating chain ber (G) above the fire,jtheiractionisinuch injured andsometimes entirelyqdest i (when the furnaceis highly heated) by are rentof hot air forcingfitslwayl up through the flues into therooins, andltheveryhobject for which the iniprovenient was desi nedis thus perverted.Much heatis also ostAbyI radiation through the walls of the. air heat{ing chamber (A), (seedraWingXaccompanyj ing Sawyers patent.) Referringagainjjto. I the accompanying drawings it ibe I .y foundthat by thearrangementthereinshownl f all these defects are fentirely obviatedQreducing the size of ventilatingchamber (B) making it onlysufficientlylarge to receive the pipe (0) and ventilating flues (F F)and surrounding it by the hot air chamber (C) much is gained in thecapacity of the latter, and the heat radiating from chamber (B), insteadof being lost is collected in chamber (0).

The tendency of caloric being to rise all the heat created by thefurnace accumulates at the top of chamber (C) and by taking from thencethe pipes (D D) conducting the heat to the different apartments, thegreatest effect is obtained.

The heat which in Sawyers device is lost by radiation through the wallsof the air heating chamber is here saved and carried up into the upperpart of chamber (C) through the spaces or opening (J J), and the outsideof the furnace whilein operation is kept perfectly cool.

The ventilating flues (F F) being introduced into the apparatus farbelow the fire, no heat can by any possibility be forced through theminto the apartments from which they lead, the velocity of the upwardcurrent within them is much increased thus securing a more thorough andreliable ventilation.by inclosing them during their passage through thefurnace within the outer casings (N N) leaving a space between thecasings and the fiues, the heat which would otherwise radiate throughinto the fiues is saved and carried to the top of chamber (G) by theupward current within the casing (N). In Sawyers device the current ofair striking against the flat underside of the lower radiating drum andfinding no direct means of escape is retarded in its progress and byremaining'long in contact with the highly heated surface of the dome (P)v becomes desiccated and unfit for use. This is also the case with theair 'inclosed between the upper and lower radiating drums and pipes (GG). By making the openings (I I) through both the drums aneasy anddirect passage is established for the air from below which thus retainsits purity. The heating power of the furnace is also thereby greatlyincreased.

We do not claim the ventilating chamber (B) the hot air chamber (C) hotair pipes (D D), &c. for these have been previously used, nor do weclaim either of the parts herein described separately; but

Having thus described our invention what we claim as our invention anddesire to secure by Letters Patent,is

The arrangement of the ventilating pipes F, extending down to the bottomof the furnace, drum B, and chimney flue A, in combination with afurnace which is constructed with a central fire box K, P, L, radiatingdrum H, H, G, G, I, I, O, and air circulating and heating chamberextending up beyond the ventilating drum; in the manner and for thepurposes herein described.

MOSES W. LESTER. MAX HJORTSBERG.

Witnesses:

LEWIS DODGE, O. B. MAPLEY.

